import { readFileSync, readdirSync } from 'fs'

let idPerfix = ''
const svgTitle = /<svg([^>+].*?)>/
const clearHeightWidth = /(width|height)="([^>+].*?)"/g

const hasViewBox = /(viewBox="[^>+].*?")/g

const clearReturn = /(\r)|(\n)/g

function findSvgFile(dir) {
	const svgRes = []
	const dirents = readdirSync(dir, {
		withFileTypes: true
	})
	for (const dirent of dirents) {
		if (dirent.isDirectory()) {
			svgRes.push(...findSvgFile(dir + dirent.name + '/'))
		} else {
			const svg = readFileSync(dir + dirent.name)
				.toString()
				.replace(clearReturn, '')
				.replace(svgTitle, ($1, $2) => {
					// console.log(++i)
					// console.log(dirent.name)
					let width = 0
					let height = 0
					let content = $2.replace(clearHeightWidth, (s1, s2, s3) => {
						if (s2 === 'width') {
							width = s3
						} else if (s2 === 'height') {
							height = s3
						}
						return ''
					})
					if (!hasViewBox.test($2)) {
						content += `viewBox="0 0 ${width} ${height}"`
					}
					return `<symbol id="${idPerfix}-${dirent.name.replace('.svg', '')}" ${content}>`
				})
				.replace('</svg>', '</symbol>')
			svgRes.push(svg)
		}
	}
	return svgRes
}

export const svgBuilder = (path, perfix = 'icon') => {
	if (path === '') return
	idPerfix = perfix
	const res = findSvgFile(path)
	// console.log(res.length)
	// const res = []
	return {
		name: 'svg-transform',
		transformIndexHtml(html) {
			return html.replace(
				'<body>',
				`
          <body>
            <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" style="position: absolute; width: 0; height: 0">
              ${res.join('')}
            </svg>
        `
			)
		}
	}
}
